More devious is a term used to describe someone who is crafty, cunning, and sly. The crossword solutions for this term are SLYER (5 letters), SLIER (5 letters), and FOXIER (6 letters). All three of these words can be used to describe someone who is more devious than the average person. SLYER and SLIER both refer to someone who is crafty and cunning, while FOXIER implies that the person is also sly and wily.